Load Specifications
Load data in caliber .338 Lapua Mag. with .338 | 250gr | Prvi Partizan FMJ-BT bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 52,214 psi | 86% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 53,563 psi | 88% | 2654 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,346 psi | 89% | 2766 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 54,259 psi | 89% | 2707 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 51,909 psi | 85% | 2710 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,806 psi | 82% | 2671 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,570 psi | 73% | 2641 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,578 psi | 90% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 53,911 psi | 89% | 2697 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 52,025 psi | 85% | 2707 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 53,403 psi | 88% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 52,591 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,345 psi | 88% | 2762 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,795 psi | 88% | 2674 fps | 96.5% |
| Bofors RP15 | <<locked>> | 96% | 54,824 psi | 90% | 2749 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,069 psi | 85% | 2740 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 52,025 psi | 85% | 2707 fps | 99.5% |
| Bofors RP7 | <<locked>> | 82% | 52,417 psi | 86% | 2602 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 51,372 psi | 84% | 2700 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 55,114 psi | 90% | 2703 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,099 psi | 89% | 2661 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 51,895 psi | 85% | 2651 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,375 psi | 89% | 2690 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,665 psi | 90% | 2628 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 51,532 psi | 85% | 2805 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 51,561 psi | 85% | 2680 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 61% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 53,940 psi | 89% | 2641 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 53,780 psi | 88% | 2621 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 53,882 psi | 88% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 53,127 psi | 87% | 2638 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 53,635 psi | 88% | 2746 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,016 psi | 66% | 2546 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 54,520 psi | 90% | 2621 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 52,678 psi | 86% | 2618 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 53,374 psi | 88% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,665 psi | 90% | 2690 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 40,118 psi | 66% | 2569 fps | 98.6% |
| Norma MRP | <<locked>> | 90% | 51,822 psi | 85% | 2726 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 52,025 psi | 85% | 2635 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,114 psi | 89% | 2766 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,288 psi | 89% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 52,417 psi | 86% | 2703 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 62% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 53,417 psi | 88% | 2674 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 51,721 psi | 85% | 2700 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 51,808 psi | 85% | 2799 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,546 psi | 83% | 2753 fps | 97.9% |
| Rottweil R 904 | <<locked>> | 88% | 51,953 psi | 85% | 2625 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 53,301 psi | 88% | 2687 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 52,417 psi | 86% | 2602 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,520 psi | 90% | 2621 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 52,678 psi | 86% | 2618 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 53,505 psi | 88% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 52,881 psi | 87% | 2680 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 53,287 psi | 87% | 2618 fps | 98.3% |
| Somchem S365 | <<locked>> | 86% | 52,417 psi | 86% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 53,911 psi | 89% | 2664 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,505 psi | 89% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 53,809 psi | 88% | 2628 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 53,417 psi | 88% | 2644 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 53,011 psi | 87% | 2635 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 52,127 psi | 86% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 51,721 psi | 85% | 2723 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 51,648 psi | 85% | 2707 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,808 psi | 85% | 2759 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 52,997 psi | 87% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 51,779 psi | 85% | 2654 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,592 psi | 90% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 53,650 psi | 88% | 2657 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,998 psi | 57% | 2323 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 46,833 psi | 77% | 2552 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 41,046 psi | 67% | 2530 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 38,986 psi | 64% | 2438 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 39,682 psi | 65% | 2480 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 38,290 psi | 63% | 2451 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 88% | 30,226 psi | 50% | 2303 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,701 psi | 73% | 2556 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,030 psi | 64% | 2434 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,824 psi | 57% | 2382 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,475 psi | 55% | 2346 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,240 psi | 48% | 2264 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,637 psi | 60% | 2477 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,662 psi | 83% | 2621 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 34,664 psi | 57% | 2375 fps | 95.4% |
| Bofors RP30 | <<locked>> | 90% | 37,231 psi | 61% | 2464 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 34,824 psi | 57% | 2382 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 49,284 psi | 81% | 2552 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 36,608 psi | 60% | 2415 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,298 psi | 79% | 2598 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 50,850 psi | 83% | 2608 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 39,581 psi | 65% | 2431 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,611 psi | 68% | 2470 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,177 psi | 69% | 2444 fps | 100% |
| Hodgdon Retumbo | 78.5 gr | 84% | 32,460 psi | 53% | 2392 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,819 psi | 79% | 2621 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 46% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,759 psi | 73% | 2493 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,633 psi | 83% | 2572 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,454 psi | 73% | 2500 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,885 psi | 64% | 2382 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 38,218 psi | 63% | 2461 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 37,521 psi | 62% | 2490 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,138 psi | 79% | 2526 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,615 psi | 77% | 2523 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,124 psi | 49% | 2208 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 44,759 psi | 73% | 2526 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 30,821 psi | 51% | 2346 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 36,405 psi | 60% | 2444 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 45,861 psi | 75% | 2539 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 37,840 psi | 62% | 2467 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,614 psi | 73% | 2536 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,357 psi | 51% | 2297 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 47% | 1526 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,601 psi | 77% | 2572 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,773 psi | 74% | 2589 fps | 100% |
| ReloadSwiss RS 76 | 84 gr | 84% | 31,473 psi | 52% | 2365 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,495 psi | 66% | 2566 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 40,277 psi | 66% | 2418 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,319 psi | 63% | 2421 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,284 psi | 81% | 2552 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,138 psi | 79% | 2526 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,615 psi | 77% | 2523 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,094 psi | 77% | 2480 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,985 psi | 62% | 2415 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 40,901 psi | 67% | 2408 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,902 psi | 70% | 2497 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,928 psi | 64% | 2405 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 51,227 psi | 84% | 2526 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,253 psi | 78% | 2533 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,736 psi | 55% | 2290 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,601 psi | 77% | 2536 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,652 psi | 62% | 2415 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,189 psi | 64% | 2490 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 39,334 psi | 65% | 2484 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 44,991 psi | 74% | 2638 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,180 psi | 76% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,472 psi | 80% | 2598 fps | 99.7% |
| Winchester StaBALL HD | 76.8 gr | 80% | 29,834 psi | 49% | 2369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,534 psi | 58% | 2336 fps | 95.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 75 powders for .338 Lapua Mag. loaded with the .338 | 250gr | Prvi Partizan FMJ-BT. Winchester StaBALL HD delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,808 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .338 Lapua Mag. with the .338 | 250gr | Prvi Partizan FMJ-BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.